Estimate sums, products, quotients, and percent results, then judge whether an exact answer is reasonable.
Rewrite an expression using specified benchmarks
Problem
Estimate \(398~+~204\) by rounding each addend to the nearest hundred.
Big Picture
What this problem is really about
This estimate keeps the addition structure but replaces each addend with a nearest-hundred benchmark. We’ll round the two addends separately, preserve the plus sign between their replacements, and add the friendlier hundreds. That benchmark sum should stay close to the exact total.
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